2 * UCW Library -- Parsing of command-line options
4 * (c) 2013 Jan Moskyto Matejka <mq@ucw.cz>
5 * (c) 2014 Martin Mares <mj@ucw.cz>
7 * This software may be freely distributed and used according to the terms
8 * of the GNU Lesser General Public License.
13 #include <ucw/opt-internal.h>
14 #include <ucw/stkstring.h>
15 #include <ucw/strtonum.h>
22 * Value flags defaults
23 * ~~~~~~~~~~~~~~~~~~~~
25 * OPT_NO_VALUE for OPT_BOOL, OPT_SWITCH and OPT_INC
26 * OPT_MAYBE_VALUE for OPT_STRING, OPT_UNS, OPT_INT
27 * Some of the value flags (OPT_NO_VALUE, OPT_MAYBE_VALUE, OPT_REQUIRED_VALUE)
28 * must be specified for OPT_CALL and OPT_USER.
30 static uns opt_default_value_flags[] = {
31 [OPT_CL_BOOL] = OPT_NO_VALUE,
32 [OPT_CL_STATIC] = OPT_MAYBE_VALUE,
33 [OPT_CL_SWITCH] = OPT_NO_VALUE,
34 [OPT_CL_INC] = OPT_NO_VALUE,
42 struct opt_precomputed * opts;
43 struct opt_precomputed ** shortopt;
44 struct opt_item ** hooks;
52 // FIXME: Make public?
53 void opt_failure(const char * mesg, ...) {
56 vfprintf(stderr, mesg, args);
57 fprintf(stderr, "\n");
59 exit(OPT_EXIT_BAD_ARGS);
62 static char *opt_name(struct opt_context *oc, struct opt_precomputed *opt)
64 struct opt_item *item = opt->item;
66 if (item->letter >= OPT_POSITIONAL_TAIL)
67 res = stk_printf("positional argument #%d", oc->positional_count);
68 else if (opt->flags & OPT_SEEN_AS_LONG)
69 res = stk_printf("--%s", opt->name);
71 res = stk_printf("-%c", item->letter);
75 #define THIS_OPT opt_name(oc, opt)
77 void opt_precompute(struct opt_precomputed *opt, struct opt_item *item)
81 opt->name = item->name;
82 uns flags = item->flags;
84 if (item->letter >= OPT_POSITIONAL_TAIL) {
85 flags &= ~OPT_VALUE_FLAGS;
86 flags |= OPT_REQUIRED_VALUE;
88 if (!(flags & OPT_VALUE_FLAGS)) {
89 ASSERT(item->cls != OPT_CL_CALL && item->cls != OPT_CL_USER);
90 flags |= opt_default_value_flags[item->cls];
96 static void opt_invoke_hooks(struct opt_context *oc, uns event, struct opt_item *item, char *value)
98 for (int i = 0; i < oc->hook_count; i++) {
99 struct opt_item *hook = oc->hooks[i];
100 if (hook->flags & event)
101 hook->u.hook(item, event, value, hook->ptr);
105 static struct opt_precomputed * opt_find_item_longopt(struct opt_context * oc, char * str) {
106 uns len = strlen(str);
107 struct opt_precomputed * candidate = NULL;
109 for (int i = 0; i < oc->opt_count; i++) {
110 struct opt_precomputed *opt = &oc->opts[i];
114 if (!strncmp(opt->name, str, len)) {
115 if (strlen(opt->name) == len)
117 } else if (opt->item->cls == OPT_CL_BOOL && !strncmp("no-", str, 3) && !strncmp(opt->name, str+3, len-3)) {
118 if (strlen(opt->name) == len-3)
124 opt_failure("Ambiguous option --%s: matches both --%s and --%s.", str, candidate->name, opt->name);
132 opt_failure("Invalid option --%s.", str);
135 // FIXME: Use simple-lists?
136 #define OPT_PTR(type) ({ \
138 if (item->flags & OPT_MULTIPLE) { \
142 } * n = xmalloc(sizeof(*n)); \
143 clist_add_tail(item->ptr, &(n->n)); \
149 static void opt_parse_value(struct opt_context * oc, struct opt_precomputed * opt, char * value) {
150 struct opt_item * item = opt->item;
152 if (opt->count++ && (opt->flags & OPT_SINGLE))
153 opt_failure("Option %s must be specified at most once.", THIS_OPT);
155 if (opt->flags & OPT_LAST_ARG)
156 oc->stop_parsing = 1;
158 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_VALUE, item, value);
162 if (!value || !strcasecmp(value, "y") || !strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"))
163 *((int *) item->ptr) = 1 ^ (!!(opt->flags & OPT_NEGATIVE));
164 else if (!strcasecmp(value, "n") || !strcasecmp(value, "no") || !strcasecmp(value, "false") || !strcasecmp(value, "0"))
165 *((int *) item->ptr) = 0 ^ (!!(opt->flags & OPT_NEGATIVE));
167 opt_failure("Boolean argument for %s has a strange value. Supported (case insensitive): 1/0, y/n, yes/no, true/false.", THIS_OPT);
172 switch (item->type) {
177 e = cf_parse_int(value, OPT_PTR(int));
179 opt_failure("Integer value parsing failed for %s: %s", THIS_OPT, e);
185 e = cf_parse_u64(value, OPT_PTR(u64));
187 opt_failure("Unsigned 64-bit value parsing failed for %s: %s", THIS_OPT, e);
191 *OPT_PTR(double) = NAN;
193 e = cf_parse_double(value, OPT_PTR(double));
195 opt_failure("Floating-point value parsing failed for %s: %s", THIS_OPT, e);
201 e = cf_parse_ip(value, OPT_PTR(u32));
203 opt_failure("IP address parsing failed for %s: %s", THIS_OPT, e);
207 *OPT_PTR(const char *) = NULL;
209 *OPT_PTR(const char *) = xstrdup(value);
217 if ((opt->flags & OPT_SINGLE) && *((int *)item->ptr) != -1)
218 opt_failure("Multiple switches: %s", THIS_OPT);
220 *((int *)item->ptr) = item->u.value;
223 if (opt->flags & OPT_NEGATIVE)
224 (*((int *)item->ptr))--;
226 (*((int *)item->ptr))++;
229 item->u.call(item, value, item->ptr);
234 e = item->u.utype->parser(value, OPT_PTR(void*));
236 opt_failure("Cannot parse the value of %s: %s", THIS_OPT, e);
243 opt_invoke_hooks(oc, OPT_HOOK_AFTER_VALUE, item, value);
246 static int opt_longopt(struct opt_context * oc, char ** argv, int index) {
248 char * name_in = argv[index] + 2; // skipping the -- on the beginning
249 uns pos = strchrnul(name_in, '=') - name_in;
250 struct opt_precomputed * opt = opt_find_item_longopt(oc, strndupa(name_in, pos));
253 opt->flags |= OPT_SEEN_AS_LONG;
255 if (opt->item->cls == OPT_CL_BOOL && !strncmp(name_in, "no-", 3) && !strncmp(name_in+3, opt->item->name, pos-3)) {
257 opt_failure("Option --%s must not have any value.", name_in);
259 } else if (opt->flags & OPT_REQUIRED_VALUE) {
261 value = name_in + pos + 1;
263 value = argv[index+1];
265 opt_failure("Option %s must have a value, but nothing supplied.", THIS_OPT);
268 } else if (opt->flags & OPT_MAYBE_VALUE) {
270 value = name_in + pos + 1;
273 opt_failure("Option %s must have no value.", THIS_OPT);
275 opt_parse_value(oc, opt, value);
279 static int opt_shortopt(struct opt_context * oc, char ** argv, int index) {
281 struct opt_precomputed * opt;
284 while (o = argv[index][++chr]) {
285 if (o < 0 || o >= 128)
286 opt_failure("Invalid character 0x%02x in option name. Only ASCII is allowed.", o & 0xff);
287 opt = oc->shortopt[o];
290 opt_failure("Unknown option -%c.", o);
292 opt->flags &= ~OPT_SEEN_AS_LONG;
294 if (opt->flags & OPT_NO_VALUE)
295 opt_parse_value(oc, opt, NULL);
296 else if (opt->flags & OPT_REQUIRED_VALUE) {
297 if (argv[index][chr+1]) {
298 opt_parse_value(oc, opt, argv[index] + chr + 1);
300 } else if (!argv[index+1])
301 opt_failure("Option -%c must have a value, but nothing supplied.", o);
303 opt_parse_value(oc, opt, argv[index+1]);
306 } else if (opt->flags & OPT_MAYBE_VALUE) {
307 if (argv[index][chr+1]) {
308 opt_parse_value(oc, opt, argv[index] + chr + 1);
311 opt_parse_value(oc, opt, NULL);
320 static void opt_positional(struct opt_context * oc, char * value) {
321 oc->positional_count++;
322 uns id = oc->positional_count > oc->positional_max ? OPT_POSITIONAL_TAIL : OPT_POSITIONAL(oc->positional_count);
323 struct opt_precomputed * opt = oc->shortopt[id];
325 opt_failure("Too many positional arguments.");
327 opt->flags &= OPT_SEEN_AS_LONG;
328 opt_parse_value(oc, opt, value);
332 static void opt_count_items(struct opt_context *oc, const struct opt_section *sec)
334 for (const struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
335 if (item->cls == OPT_CL_SECTION)
336 opt_count_items(oc, item->u.section);
337 else if (item->cls == OPT_CL_HOOK)
339 else if (item->letter || item->name) {
341 if (item->letter > OPT_POSITIONAL_TAIL)
342 oc->positional_max++;
347 static void opt_prepare_items(struct opt_context *oc, const struct opt_section *sec)
349 for (struct opt_item *item = sec->opt; item->cls != OPT_CL_END; item++) {
350 if (item->cls == OPT_CL_SECTION)
351 opt_prepare_items(oc, item->u.section);
352 else if (item->cls == OPT_CL_HOOK)
353 oc->hooks[oc->hook_count++] = item;
354 else if (item->letter || item->name) {
355 struct opt_precomputed * opt = &oc->opts[oc->opt_count++];
356 opt_precompute(opt, item);
358 oc->shortopt[(int) item->letter] = opt;
363 static void opt_check_required(struct opt_context *oc)
365 for (int i = 0; i < oc->opt_count; i++) {
366 struct opt_precomputed *opt = &oc->opts[i];
367 if (!opt->count && (opt->flags & OPT_REQUIRED)) {
368 struct opt_item *item = opt->item;
369 if (item->letter > OPT_POSITIONAL_TAIL)
370 opt_failure("Required positional argument #%d not found.", item->letter - OPT_POSITIONAL_TAIL);
371 else if (item->letter == OPT_POSITIONAL_TAIL)
372 opt_failure("Required positional argument not found.");
373 else if (item->letter && item->name)
374 opt_failure("Required option -%c/--%s not found.", item->letter, item->name);
375 else if (item->letter)
376 opt_failure("Required option -%c not found.", item->letter);
378 opt_failure("Required option --%s not found.", item->name);
383 int opt_parse(const struct opt_section * options, char ** argv) {
384 struct opt_context * oc = alloca(sizeof(*oc));
385 memset(oc, 0, sizeof (*oc));
387 opt_count_items(oc, options);
388 oc->opts = alloca(sizeof(*oc->opts) * oc->opt_count);
389 oc->shortopt = alloca(sizeof(*oc->shortopt) * (oc->positional_max + 257));
390 memset(oc->shortopt, 0, sizeof(*oc->shortopt) * (oc->positional_max + 257));
391 oc->hooks = alloca(sizeof (*oc->hooks) * oc->hook_count);
395 opt_prepare_items(oc, options);
397 int force_positional = 0;
399 for (i=0; argv[i] && !oc->stop_parsing; i++) {
401 opt_invoke_hooks(oc, OPT_HOOK_BEFORE_ARG, NULL, NULL);
402 if (arg[0] != '-' || force_positional)
403 opt_positional(oc, arg);
409 i += opt_longopt(oc, argv, i);
411 i += opt_shortopt(oc, argv, i);
413 opt_positional(oc, arg);
417 opt_check_required(oc);
418 opt_invoke_hooks(oc, OPT_HOOK_FINAL, NULL, NULL);